11533556481 has 4 divisors (see below), whose sum is σ = 15378075312. Its totient is φ = 7689037652.

The previous prime is 11533556477. The next prime is 11533556509. The reversal of 11533556481 is 18465533511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11533556481 - 2² = 11533556477 is a prime.

It is a super-2 number, since 2×11533556481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11533556401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922259411 + ... + 1922259416.

It is an arithmetic number, because the mean of its divisors is an integer number (3844518828).

Almost surely, 2^11533556481 is an apocalyptic number.

It is an amenable number.

11533556481 is a deficient number, since it is larger than the sum of its proper divisors (3844518831).

11533556481 is an equidigital number, since it uses as much as digits as its factorization.

11533556481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844518830.

The product of its digits is 216000, while the sum is 42.

The spelling of 11533556481 in words is "eleven billion, five hundred thirty-three million, five hundred fifty-six thousand, four hundred eighty-one".